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                                 Abstract:Specifications of microwave system for BEPCⅡ-Linac were enhanced by a wide margin in comparison with those of the microwave system for BEPC-Linac. For this reason many RF components must be developed and improved. This paper introduces the developments of SLED detuning system, accelerating section, high power waveguide valve, high power dummy-load, and medium & high power waveguide attenuator/phase shifters. High power operation of the microwave system has been carried out.
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                        References
	
			| [1] | . ZHAO Feng-Li, HOU Mi et al. Microwave System forB EPCⅡ-Linac (in Chinese)(赵风利,侯泪等.直线加速器微波系统的改进,IHEP-BEPCⅡ)2. OHSAWA S et al. High-Power Hybrid Attenuator  Phase-Shifter Systems. Japan: KEK, National Laboratory for High Energy Physics. 19903. ZHAO Feng-Li et al. High Energy Phys. and Nucl. Phys.,2004, 28(11): 1127(in Chinese)(赵风利等.高能物理与核物理,2004, 28(11): 1127)4. ZHOU Shu et al. Development Report for BEPC-Linac,1989.(in Chinese)(周述等.BEPC注入器研制报告,1989)5. Matsumoto H et al. Experience on the High Power SiC Mocrowave Dummy-Load Using SiC Absorber. Japan:KEK, National Laboratory for High Energy Physics. 1999 
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